A Swim-Fitness, Competitive Swim Training, Lap Swimming and Aqua Therapy Fin. Subtle spoon-shaped blade without ribbed edges. Enhances power stroke efficiency with minimal recovery stroke resistance. Neofins float and their bright colors enable them to be easily located when dropped in the water. Fitness Fin available in U.S. Men’s Sizes: S 5-7, M 7-9, L 9-11, XL11-13.